Jig



Feb. 17, 1931.

F. u. PAULlNs JIG Filed April 12, 1926 42 Sheets-Sheet l gnuevd'oz:@duff/guas F. U. PAULINS Feb. 17, 1931.

Filed April l2, 1926 2 Sheets-Sheet 2 Patented Feb. 17, 1931 `iTED dem@YFamilia; PAULINS, 0F PONT-IAC, MICHIGAN JIG - Application( inea April12,

LThis invention? relatesto ua jig and' hasv Vspecial lreference `to workclamping means V-for holding apiece ofwork tobeoperated *l uponby drillsand other tools.

' f "My invention aims to provide aV jig embodying a reciprocableclamping member and novel means for adjusting said clamping member, saidmeans being constructively arranged Yso that the clamping member may"'10 be firmly held in engagement with a piece of work or yieldably heldin engagement therewith, and in either instance quicklyreleased.

My invention further aims to provide a jig wherein a work clampingmember is reciprocable on a post with means extending through said postfor reciprocating said clamping member. Additional means is locatedunder said clamping member and at the V*lower end` of said post foroperating the'rstmentioned means.

My invention'still 'further aimsy to provide adurable, (inexpensive jigthat may be easily andquickly adjusted, and the'jig includesinterchangeable adapters and other i5 devices bywhich thejig can beconveniently ""7 away and partly in section;

Fig. 3 is a front elevation of the jig partly broken away and partly insection;

Fig. 4 is a side velevation ofthe jig, partly brokenaway and partly in4s'ection,'and

Fig. 5 'is a' horizontal sectional view taken on the line V-V of Fig. 3.

Thejig comprisesja hollow substantially rectangular base 1 andcommunicating there# withis a tubular post 2. This post is located 5 olfcenter, so as to provide clearancefor a tubular adapter, anvil or workengaging socket detachably mounted in the base.

f Slidable 'on' the tubular post 2 is the sleeve 4 of a work clampingmember 5 which is provided-with an interchangeable adapter, tu-

like.

1926. Serial No. 101,293.

bular guide or work engaging device 6 adapted to cooperate with theadapter 3 4in engaging and supporting a piece of work in position to beoperated upon. As shown, the piece of work is the bearing end of alconnecting rod adapted to be drilled or reamed by a drill or bit passingthrough or into the ada ters 3 and YG'. In some instances these intereangeahle adapters may be' 'dispensed with and the clamping member 5'3"*used with the base 1 for holding a-'piece of work in position.

The tubular post 2 is provided witha longitudinalgroove Sand the sleevea groove'Q confronting the gro-ove S'so 'th'atva key 10 may be placed in'said groove to' prevent rotation of the sleeve 4 relative to'the l post2. The-sleeve 4,l adjacent'the' groove 9, Vhas an enlargement 11 'forkey engagingscrewsV 12 that may be equipped "withl lockt" nuts 13. Thescrews 12 may be adjusted to properly position the "key 10 relativetothe post 2, and vsaid key may be retained within the groovesS and 9 bydowel pins14 or the end thereof notched or castellatedfas at and adaptedto be held against rotation byv a cli 19 on the cap. Y

bcrewed into the nut or bushing 17 is a stem 20 of a stirrup 21 andpivotally mounted in saidstirrup byV al pin V2 2 is the upper endl of aconnecting rod23 which entends downwardly in the, post 2 into the base1.

Journaled in the sidewalls of the base 1 is a transversely disposed rockshaft 24and keyed or otherwise mounted on said-rock curved end of saidrod that permits the lowerA pivotal connection with the rock shaft 2411ssuming a position on the opposite side of'said rock shaft from thepivotalconne'ction at the 1apper end of the connecting rod.Thi'sfposition of the pivotal'connections is on the near side of a lineA passing through the center of the -rock shaft 24, as indicated in Fig.1, and consequently the connections cannot assume a locked position forthe clamping member 5 in engagement with the piece of work 7. lt will benoted that the cranks 25 and the inner wall of the post 2 are cut awayto provide clearance for reciprocation of the connecting rod 23.

On one end of the rock shaft 2li is fixed a lever 27 by which the rockshaft may be con veniently rocked and the upwardly swinging movement ofthe lever 2 is limited by a stop pin 28 carried by the side of the piece1.

At the opposite end of the rock shaft 24 is a notched collar 29 locatedin a side extension 30 of the base 1. A spring aressed non-rotatabledetent or latch 31 is located within the side extension 30 and togetherwith said notched collar retained in said side ex :ension by a closureplate 32. The detent or latch 31 and the collar 29 cooperate inpreventing accidental movement of the rockable shaft 24 and the lever 2Tafter the clamping member 5 is raised.

The rock shaft 24 has other cranks to which are pivotally connectedtension devices located within the base 1 and adapted for yieldablyholding the rock shaft 24 against counter-clockwise rotation, viewingFig. 1. Each tension device comprises telescopic members 33 having theouter ends thereof provided with spring abut-ments 34C and 35 for theend convolutions of a. coiled expansion spring 36 encircling thetelescopic members The spring abutments 35 are connected to cranks ofthe rock shaft 24, and the spring abutments 34 are connected totransversely disposed rods 37 mounted in the hollow members 1. Thetension devices are disposed in parallelism at opposite sides of thevertical axis of the tubular post 2 and said tension devices have anexpansive force constantly exerting pressure against the rock shaft 24to prevent counter-clockwise rotation of said rock shaft, except whensaid tension devices are manually placed under compression. rlhis may beaccomplished by swinging the lever 27 to substantially a verticalposition whereby the work clamping member 5 is raised, or a piece ofwork may be forcibly placed in position and thus cause the clampingmember 5 to yield until the piece of work is in position. Obviously thetension devices will more or less compensate for manufacturingdiderences of size in pieces of work to be held by the Great differencesare taken care of by interexchanging the adapters 3 and 6 and otherchanges may be taken care of byadjusting the sleeve 4L- of the clampingmember relative to the upper end of the connecting rod 23.

The base 1 may be provided with lat-eral slotted lugs 38 to facilitatemounting it on a bench or other support and with the firmly anchored itmay be safely and expediitously manipulated. I attach considerableimportance to the tension devices being housed and protected within thehollow base 1, and with the sleeve l of the clamping member 5 guided onthe rigid post 2 there is a substantial support for the clamping memberwhich prevents any displacement during manipulation of the lever 27.rThis lever permits of considerable leverage being obtained for clampinga piece of work and the lower curved or off-set end of the connectingrod 23 may afford an over-center locking position for the lower end ofthe connecting rod 23 so as to afford a positive and reliable clampingcondition for the piece of work. However, in the position shown in Fig.1 the clamping member is yieldably held by the tension devices, so thatsaid clamping member may shift to care for any irregularities in sizes,and may be instantly released by an upwardmovement of the lever 27 whichplaces the tension devices under compression with stored energy forturning the shaft 24 and lowering the clamping member 3 when the lever2? is moved sufficiently to avoid holding by the detent or latch 31. Itis by 7irtue of this detent or latch that the clamping member 5 may beretained in a raised position against accidental movement, and it isonly necessary to strike or slightly move the lever 27 to release thedetent 31 and permit the tension device tolower the clamping member.

It is to be noted that by removing the cap 15 that another type ofclamping member having a sleeve may be substituted for the clampingmember 5, and while in the drawings there is illustrated a preferredembodiment of my invention, it is to be understood that the structuralelements are susceptible to such variations and modifications as fallwithin the scope of the appended claims.

What I claim is 1. A jig comprising a hollow base, a post, a workclamping member slidable on said post and adapted to cooperate with saidbase in holding a piece of work on said base remote from said post, aconnecting rod in said post extending into said hollow base adapted forsliding said work clamping member on said post, said connecting rodbeing adjustably connected to said clamping member within said posthaving a curved lower end, and a crank shaft in said hollow base offsetfrom the axis of said post, said curved connecting rod being pivoted toa crank on said shaft, adapted for shifting said connecting rod,movement of said crank causing the pivot of said curved connecting rodto pass under and beyond the axis of the crank shaft, and tending tolock said work clamping member, and a handle for operating said crankshaft.

2. A jig as called for in claim 1, and a spring tension device disposedin said hollow base connected to said shaft and adapted to hold saidcurved connecting rod With its pivot beyond the axis of the crank shaftvvhereby to positively lock said Work clamping member normally in a Workclamping position.

3. Work clamping means comprising a base, a Work guide thereon, a singlepost on said base to one side of said Work guide, a Work clamping memberabove said Work guide and having a sleeve slidable on said post, aconnecting rod extending upwardly in said post and connected to theupper end of the sleeve of said Work clamping member, a rock shaft insaid base operatively connected to said connecting rod, a handle forrocking said shaft, and a tension device laterally disposed in said baseadapted to resist rocking of said shaft and adapted for holding saidconnecting rod in looked position With the Work clamping member in aWork engaging position.

4. Work clamping means comprising a hollow base, a reciprocable Workclamping member adapted to cooperate With said base in holding a pieceof Work, rockable means inclosed by said base adapted for reciprocatingsaid clamping member, a handle adapted for rocking said rockable meansto a locked position relative to said clamping member, and yieldablemeans in a plane below said rockable means and bearing against saidrockable means adapted for retaining said rockable means in a lockedposition.

5. Work clamping means comprising a base, a reciprocatable Work clampingmember adapted to cooperate With said base in holding a piece of work, aconnecting rod having a pivotal connection With said Work clampingmember, a crank rock shaft in said base at one side of the axis of thepivotal connection of said connecting rod and under Which shaft extendsa lovver curved end of said connecting rod With a pivotal connectionwith the crank of said rock shaft so that the pivotal connection at thecurved end of said connecting rod may assume positions on opposite sidesof said rock shaft to afford a secured position for said Work clampingmember, and a handle for rocking said crank shaft.

6. Work clamping means as called for in claim 5, and yieldable means insaid base bearing against said rock shaft to maintain a secured positionfor said Work clamping member.

7. Work clamping means comprising a hollow base, a Work clamping memberabove said base, a connecting rod extending out of said base andoperatively connected to said clamping member for shifting said clampingmember relative to a piece of `Work, said connecting rod having a curvedend in said base, a rock crank shaft in said base and having its crankportion connected to the curved end of said connecting rod, a handle forrocking said crank shaft and a tension device in said base operatableagainst said rock shaft and in a plane substantially at a right anglethereto to effect a clamped condition of said Work clamping member.

8. Work clamping means comprising a base, a vertically reciprocableclamping member above said base, a connecting rod extending into saidbase adapted for reciprocating said clamping member, a crank shaftdisposed in said base and oifset from the axis of said post, a crank onsaid shaft and connected to said connecting rod, a spring device mounted'in said base and acting on said crank, and adapted to rock said shaftand operate said Work clamping member, and means for compressing saidspring device to relieve the tension on said crank. Y

9. A jig comprising a hollow base, a post, a Work clamping member onsaid post and adapted to cooperate With said base in holding a piece ofWork, rockable means enclosed in said base, a handle for operating saidrockable means, means for exerting spring pressure against said rockablemeans tending to rotate the same and lovver said Work clamping member,and a stop member for retaining said Work clamping member out ofengagement With the Work against said spring pres- In testimony whereofI affix my signature.

FRANK U. PAULINS.

